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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
RETIREMENT BENEFITS RETIREMENT BENEFITS
The cost to the company of its pension and other postretirement benefit (OPB) plans is shown in the following table:
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
Pension
Benefits
 
OPB
 
Pension
Benefits
 
OPB
$ in millions
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost (benefit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
102

 
$
92

 
$
4

 
$
4

 
$
306

 
$
276

 
$
13

 
$
12

Interest cost
307

 
340

 
17

 
20

 
920

 
1,020

 
50

 
60

Expected return on plan assets
(594
)
 
(525
)
 
(26
)
 
(23
)
 
(1,782
)
 
(1,576
)
 
(77
)
 
(69
)
Amortization of prior service credit
(15
)
 
(15
)
 
1

 
(1
)
 
(45
)
 
(44
)
 
3

 
(2
)
Net periodic benefit cost (benefit)
$
(200
)
 
$
(108
)
 
$
(4
)
 
$
—

 
$
(601
)
 
$
(324
)
 
$
(11
)
 
$
1


Employer Contributions
The company sponsors defined benefit pension and OPB plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006.
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended September 30
 
Nine Months Ended September 30
$ in millions
2020
 
2019
 
2020
 
2019
Defined benefit pension plans
$
24

 
$
18

 
$
70

 
$
64

OPB plans
7

 
10

 
30

 
34

Defined contribution plans
116

 
98

 
472

 
377